A solar proposal becomes more useful when it starts with your electricity use rather than an assumed system size. Collect recent bills and consider what happens inside the property during a normal day. Monthly totals show overall consumption, but they do not explain when that electricity is needed.
Separate energy from demand
A bill records energy used over a period, usually in kilowatt-hours. Appliances also have a power requirement while operating. These are different questions: how much energy do you use, and how many devices must run together? Ask your installer to consider both when preparing the system recommendation.
Build a practical usage record
Note business opening hours, air-conditioning schedules, water pumping and evening household activity. Identify seasonal changes and planned new appliances. A property with substantial daytime use may use solar generation differently from one occupied mainly at night. Present the record alongside bills so the design reflects actual routines.
Turn a bill into a daily starting point
Illustrative example: a property uses 600 kWh over a 30-day billing period. That averages 20 kWh a day, but it does not mean the property needs 20 kW of panels. If most consumption occurs after sunset, daytime generation and usable battery energy need separate assessment. Add a simple morning, afternoon and evening usage diary to the bill so the proposal can explain when generation is likely to be consumed.
Your practical checklist
- Collect bills covering different seasons
- List large appliances and their operating hours
- Mark which loads need backup during an outage
Can one bill determine system size?
It is a starting point. Seasonal bills, daytime usage, roof constraints and simultaneous appliance demand are also needed.
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